I honestly really respect Itoshi for being so honest. Growing up without parental figures and trying to raise your own child, that's a lot to ask of anyone. Pair that with the fact that he's still in the process of growing up mentally, I can understand why he feels the way that he does. I'm sure that the two of them will eventually have children, Itoshi will learn just how great of a father he is even if Tsumugi has to go through hurdles to convince him. I wish these two luck!